Expansion bolt



n. 1935 H. NORWOOD ,018.

Patented Jan. 22, 1935 EXPANSION BOLT Harry G. Nor-wood, New York, N.Y.,- assignor to Anna M. Percival, Long Island City, N. Y.

Application January 9,

7 Claims.

This invention relates to a novel and improved type of expansion bolts,and is especially designed to be utilized in connection with stone,metal, cement, brick, concrete walls, posts and other materials andstructures to which it may be readily, successfully, usefully andpractically applied.

The main object of theinvention is to'provide a practical, durable,simple, economical and thoroughly effective expansion bolt from a singlepiece of suitable metal adapted to be forced within a cavity, socket oropening formed in a foundation, and to be distorted and compressed intoextremely tight contact with the wall of such cavity, socket or opening.

Another object of the invention is to so construct this novel type ofexpansion bolt from a single piece of metal with its headed portion atits upper or outer end that its body portion is compressed intermediateits length to form a plurality of outwardly extended lugs or ribs, witha recess formed within said body at each side of each lug or rib, sothat, when the bolt is driven or forced within a cavity or socket for.ned in any desired material or foundation, the said lugs or ribs willbe caused to be compressed and distorted into the recessed portion ofthe bolt and become so intensely compressed against the wall of thecavity or socket that it will be permanently anchored therein againstrotation, looseness, or accidental removal, and thereby practically andsuccessfully serve the purpose for which it is intended.

The foregoing and such other objects as may appear from the ensuingdescription are accomplished by the construction, formation andcombination of the elements hereinafter more fully described,illustrated in the accompanying drawing, and particularly pointed out inthe claims appended hereto, it being understood that slight changes inthe precise formation, proportions and minor details of construction maybe resorted to without departing from the spirit or sacrificing any ofthe advantages of the invention.

In the accompanying drawing forming a part of this specification it willbe seer that:

Figure 1 is an elevation of the improved type of expansion boltembodying my invention.

Figure 2 is an elevation of the bolt, showing the projecting ribsdistended after having been compressed from the body portion.

Figure 3 is a similar elevation of the bolt, showing said bolt in itslocked position after having been forced within a socket or cavityformed within a suitable foundation.

Figure 4 is an enlarged cross-section taken in the plane of the dottedlines 44, Fig. 2.

Figure 5 is an enlarged cross-section taken in the plane of the dottedlines 5-5, Fig. 3, and

Figure 6 is a cross-section of a slightly modified form of expansionbolt.

1934, Serial No. 705,955

In the embodiment of my invention as-illus- Hated, it will be seen byreference to the drawing that the numeral 2 designates the body portionof my novel bolt, 3 is the headed portion, and

4 indicates the ribs or lugs which are compressed from the body portionof the bolt intermediate its length and extend outwardly beyond theouter surface of the other portion of the body, with a recess 5 formedwithinsaid body at each side of each of the ribs or lugs, while thenumeral 6 indicates a socket or cavity which is formed within a suitablefoundation 6'.

It will be readily perceived that when the b0 is forced or driven withinthe cavity or socket 6 the slightly downwardly inclined distended ribsor lugs 4 will be distorted and compressed, a portion thereof beingforced within the recess 5, and another portion being compressed anddistorted tightly against the wall of the cavity, thereby maintainingthe bolt in a securely locked position within the said cavity.

By reference to Fig. 6 will be seen a slightly modified form of bolt 2indicating the body portion formed with oppositely disposed extended ribor lug members 7, said lug members being weakened at the point wherethey form an integral part of the body portion having a recess 8 formedwithin the body portion at one side of each lug or rib, and a recess 8'at the opposite side of each lug, as shown in said Fig. 6.

It will be evident that my improved and novel type of bolt may be formedfrom a rod of suitable elasticmetal, and that the body portion is formedby a suitable die with the same operation from a rod with the headportion upset.

It is readily obvious that the modified form of bolt, such as is shownin Fig. 6, will be caused to assume a locked position when driven into acavity in the same manner hereinbefore 'described.

I desire it to be understood that this particular bolt may be formedfrom .a single piece of suitable spring steel or any other-desirableelastic metal, and may be made of any desirable dimensions required forits particular use to suit any purpose for which it may be successfullyemployed, and may be formed by any suitable method or machine providedwith such dies as may be required for its complete and proper formation.

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

1. An expansion bolt formed from a single piece of solid elastic metalhaving a portion compressed from opposite sides of its smooth exteriorbody portion to form oppositely and vertically disposed extended lugs orribs intermediate its length only said ribs projecting beyond thesurtended in angular relation to its cylinder surface.

2. A self locking expansion bolt formed from a single piece of solidelastic metal having a portion compressed from the smooth exteriorsurface of its body portion at opposite sides thereof to form anoppositely and vertically disposed extended rib at each side of saidbody portion centrally of its length said ribs projecting beyond thesurface of the cylinder body and longitudinally extended in angularrelation to its cylinder surface. Y

3. A self locking .expansion bolt formed from a single piece of solidelastic metal having a smooth exterior body portion, oppositely disposedextended ribs compressed from said body portion forming a recess withinthe body at each side of each rib, said body portion being of the samediameter throughout its length said ribs projecting beyond the surfaceof the cylinder body and longitudinally extended in angular relation toits cylinder surface. I

4. A self locking expansion bolt of the character described, comprisinga smooth exterior body portion compressed intermediate its length toform an extended vertically disposed rib member at each side thereof,and a laterally disposed recess-formed within said body portion at eachside of each rib member said ribs projecting beyond the surface of thecylinder body and longitudinally extended in angular relation to its,cylinder surface.

5. A locking bolt of the character described formed from a single pieceof solid elastic metal, having a body portion, a portion compressed fromO p site sides of said body portion to form oppositely disposed extendedribs intermediate the body portion, and a laterally extended recessformed within the body portion at each side of each rib intermediate itslength said ribs projecting beyond the surface of the cylinder body andlongitudinally extended in angular relation to its cylinder surface.

6. A self locking bolt formed from a single piece of solid elastic metalcomprising a body portion, a plurality of oppositely disposed ribs orlugs compressed from said body portion intermediate its length, and alaterally extended recess formed at each side of each rib within saidbody, the remaining'portion of the body being of the same diameterthroughout its entire length said ribs projecting beyond the surface ofthe cylinder body and longitudinally extended in angular relation to itscylinder surface.

"7. A self locking bolt of the character described, comprising a headportion, a body portion, a plurality of oppositely disposed ribscompressed from said body portion intermediate its length, a laterallydisposed recess formed within the smooth outer face of the body portionat each side of each rib, each of said ribs being compressed anddistorted within one of the said recesses and against the wall of acavity when forced therein to firmly retain said bolt within the cavitysaid ribs projecting beyond the surface of the cylinder body andlongitudinally extended in angular relation to its cylinder surface.

HARRY G. NORWOOD.

